@OldSurferDude
Thanks a lot for your time. I am very impressed by the amount of research !!

In the end I still can not confirm whether this relay is noiseless/mechanical or just based on electronic components (triacs).

Good news is that this Legrand noiseless relay can be driven by a mechanical relay or by a tiny SSR. I chose a SSR unit with a DinRail mount. Looks all very professional in the electrical cabinet.

I have also added an optocoupler to check the state of the light and sent it back to openHab: input is connected to lightbulb wires and signal is connected to Arduino. Works all fine!!

Next step is to receive optocoupler with DinRail mount !!

@OldSurferDude thanks a lot for your input.

You are right. I remember reading this as well. SSRs need a minimal load on output side in order to latch properly

I chose these relays because of noise: the electric cabinet for circuit breakers and relays is located next to the bedroom. At first cabinet was filed with mechanical 240V AC relays 😂 🤯

I will have a second try with the tiny Omron Chinese clones, in case they need much less load to latch properly.

Thanks a lot for you help 👍🏻
I’ll come back here to conclude (either Omron SSRs or mech style relays).

I need a bit of advice here please.

Long story short : what are the limitations for driving an SSR with an SSR ?

Long story : I have an AC ceiling light powered by a DinRail Relay (latching relay module ?). That relay is driven by numerous 240V AC wall switches as per following drawing.

Then enters MySensors!! Arduino and chineese SSR (input 3 to 32V DC, output AC 240V).

DinRail relay still reacts with wall switches but not with Arduino+SSR...
Fun fact : multimeter reads 150V at wall switch contacts (between orange and red line). This setup has been working flawlessly until now so i guess it is normal behaviour.

I have read somewhere that these SSRs (based on triacs) only switch on when load voltage gets to zero... i'm not sure i fully understand and i am here asking you whether that's the reason why it doesn't work as expected and what would be the way to get this right.

Thanks a lot for your input !

@TheoL 805 package measures 2x1.2mm... :D depends on your visual acuity !!

Two netwoks with seperate GW ?

@TheoL thanks for reporting back.

In case you haven't ordered RFM modules yet i could send you a handful of capacitors to update your nRF modules... how about that ?

I have ordered a hundred... well over a lifetime of 1pF capacitors for me :D

@TheoL thanks a lot for your message.

But i guess you are talking about the additional capacitor, in between 3.3V and ground ?

What i would like to know is if these modules you're using do have a 1pF capacitor as per picture :

Please let me know !

@Honk thanks a lot for your input

I'm building @AWI 's "connection quality meter" so i can quantify any change. Being a 10 year's experienced noob in MySensors, it takes me for ever to get it right :D

Please share your experience with faulty modules in possible connection with that missing capacitor.

Hello Everyone,

I love my MySensors + openHab setup but it gets really frustrating when a node just stops working for a while... and then comes back on track a few hours later.

So, long story short : i was just about to switch to (and order some) RFM69 modules last night when i discovered the "magic finger trick" (as i was looking for power consumption nRF vs RFM).

Looks like a pretty high number of nRF modules left the factory with a missing capacitor...

https://ncrmnt.org/2021/01/03/nrf24l01-fixing-the-magic-finger-problem/

Is it just me and everyone else knew ? ALL mt nRF24s from various suppliers are missing that capacitor... no wonder then (if that's the real culprit) !

So I have just ordered a batch of smd capacitor... i'll let you know.

Hi guys

Long time no speak but still a MySensors fan !!

My new project is a bit tougher than expected.

Here is the thing: landline phones used to be analog type, with some 40v running across the wires... adding a beacon for noisy environment was a breeze, just plug it in and whenever a call comes in the beacon picks the signal and rings.

My country has now moved to digital signal, IP i would say (please correct me if wrong terminology).
So now the phone is connected at the back of optic fiber internet box (modem) via RJ45 plug.

Needless to say that analog beacon has become useless. Beacon manufacturers have not yet moved their tech towards IP protocol.

Have you ever bumped into that kind of challenge ? :grin:

I have a spare W5100 in the drawer... would it be able to access to the phone data, to check whether it's ringing ?

Hope you get the picture and you can show me the way forward :+1:

@niccodemi I am no expert and am having a tough time with these files as well !!!

My .things file looks like so :

Bridge mqtt:broker:mosquitto "MySensorsGateway"@"Home" [host="openhabian", port="1883", secure=false]
{
	Thing topic garageDoor01 "Garage"@"Basement" {
		Channels:
			Type contact :	garageDoor01switch	[stateTopic="mysensors-out/19/1/1/0/16", transformationPattern="MAP:contact.map"]
			Type datetime : garageDoor01switch_LastUpdate
	}

As far as i understand, you're missing that "linktopic" descrption...

Hi @zkarolyi

I can not provide any help on that matter as i went the MQTT way.

The binding for serial gateway requires loads of work from the MySensors dev team; so it might tatke a while before it becomes available (if it does all together). I really appreciate all the effort put into this but i also understand that it might come to an end someday. No matter how much i prefer the serial gateway over MQTT... i ended up in the mqtt team

Back to your issu : the jar file might not be compatible with OH4

@mfalkvidd Genius !!! :open_mouth:

Hello there
I thought it would be a good idea to upgrade my system to openHAB4, as i wanted to play with my security cameras linked to a Synology NAS system...
Well it didn't go according to plan.
First openhabian had to be upgraded from Buster to Bullseye in order to get Java from 11 to 17. Then Java got upgraded, By that time MySensors stopped working. So i started over with a fresh install of MySensors. All went well until

make

hal/architecture/Linux/drivers/core/GPIO.cpp: In constructor ‘GPIOClass::GPIOClass()’:
hal/architecture/Linux/drivers/core/GPIO.cpp:53:50: warning: ‘%s’ directive output may be truncated writing up to 255 bytes into a region of size 48 [-Wformat-truncation=]
   53 |    snprintf(file, sizeof(file), "/sys/class/gpio/%s/base", de->d_name);
      |                                                  ^~
hal/architecture/Linux/drivers/core/GPIO.cpp:53:12: note: ‘snprintf’ output between 22 and 277 bytes into a destination of size 64
   53 |    snprintf(file, sizeof(file), "/sys/class/gpio/%s/base", de->d_name);
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hal/architecture/Linux/drivers/core/GPIO.cpp:62:50: warning: ‘%s’ directive output may be truncated writing up to 255 bytes into a region of size 48 [-Wformat-truncation=]
   62 |    snprintf(file, sizeof(file), "/sys/class/gpio/%s/ngpio", de->d_name);
      |                                                  ^~
hal/architecture/Linux/drivers/core/GPIO.cpp:62:12: note: ‘snprintf’ output between 23 and 278 bytes into a destination of size 64
   62 |    snprintf(file, sizeof(file), "/sys/class/gpio/%s/ngpio", de->d_name);
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
g++ -MT build/hal/architecture/Linux/drivers/core/interrupt.o -MMD -MP -march=armv8-a+crc -mtune=cortex-a53 -mfpu=neon-fp-armv8 -mfloat-abi=hard -DMY_RADIO_RF24 -DMY_GATEWAY_LINUX -DMY_GATEWAY_MQTT_CLIENT -DMY_DEBUG -DLINUX_SPI_BCM -DLINUX_ARCH_RASPBERRYPI -DMY_MQTT_CLIENT_ID=\"impassedesroses\" -DMY_MQTT_SUBSCRIBE_TOPIC_PREFIX=\"mysensors-in\" -DMY_MQTT_PUBLISH_TOPIC_PREFIX=\"mysensors-out\" -DMY_RF24_PA_LEVEL=RF24_PA_LOW -DMY_CONTROLLER_IP_ADDRESS=127,0,0,1  -Ofast -g -Wall -Wextra -std=c++11 -I. -I./core -I./hal/architecture/Linux/drivers/core -I./hal/architecture/Linux/drivers/BCM -c hal/architecture/Linux/drivers/core/interrupt.cpp -o build/hal/architecture/Linux/drivers/core/interrupt.o
hal/architecture/Linux/drivers/core/interrupt.cpp:33:10: fatal error: stropts.h: No such file or directory
   33 | #include <stropts.h>
      |          ^~~~~~~~~~~
compilation terminated.
make: *** [Makefile:99: build/hal/architecture/Linux/drivers/core/interrupt.o] Error 1

Please advise if i should start over from the very begenning (fresh SD) or just stick with openHAB 3 (but soon or later it will be superseeded)

Thanks a lot for your time people.

@skywatch great, thanks a lot for your suggestion. A bit of research on the internet educated me about these diodes :D looks like they already exist on the board that carries the relay. However, i deeply thank you for the info. This forum and internet in general is such a powerful tool :+1:

@ejlane your concern is fully justified :+1: i also come from an engineering background and i like to think "worse case scenario".
The more one look the more one find that the very vast majority or microwave ovens work the same way : there are 3 industrial switches built in the door lock. 2 of them are cabled on the "power side", one is for signaling ("software side"). So we are pretty safe on that matter.
But you are so right about safety. Magnetron do emitt dangerous waves and capacitors and stuff packed in the oven can be deadly because of high voltage.

Thanks both for suggestions. I will come back with updated sketches and beg for advice once more ;)

Hi guys,

My microwave oven broke down last month.

Not only it's a pain in the backside but it is also more waste for the planet.

A quick search on the internet educated me about safety and how to test parts.

Turns out the main board is dead (display works fine, most buttons too but "start" and "stop" buttons are useless).

New motherboard is difficult to source and is no more available from manufacturer (i bought it 2 years ago but must have been some fairly old design... :face_with_rolling_eyes: )

So back to drawing board and soldering iron:

• arduino nano
• 2.8" TFT colour display
• rotary encoder
• salvage "power board" from microwave (gives 12V and 5V)

I am pretty well on my way design-wise and need a final advice on transistors ; following are 2 arrangements regarding what i would call the "oven door transistor" (the bottom PNP one).
The 3 NPN transistors at the top drive a relay each one (magnetron, plate and heating resistance). Each transistor is driven by the arduino via a resistor.

Please accept my apologies if any of my sketches make your eyes bleed. :grin:

Which one would be the least bad and how could it be improved.

Thanks a lot for reading :+1:

EDIT: Sketches drawn with https://www.falstad.com

@JeeLet
@OldSurferDude

Thank you both :+1:

My Raspberry 3 does it all :

• gateway with nrf24 module (standard one)
• mysensors MQTT gateway
• Mosquitto broker

MQTT Explorer has been installed on my fav laptop and it helps seeing clearer.

Nevertheless i cannot reproduce the errors.

I have multiple points of view:

• node : using arduino ide serial monitor
• mysensors gateway: using tail log in a terminal window
• openHab : using tail log in an internet explorer window
• MQTT explorer : in its own window

I can sent MQTT messages from different devices :

• iOS openhab from my phone
• openhab (basic UI) from an internet explorer window
• MQTT explorer (messages can be made-up, very cool tool)
• terminal window (linux laptop via ssh)

The less reliable way of sending MQTT message is via terminal : after 2 to 10 succesfull messages it then stops working. At first, node receives messages and processes them (servo moves). But after a few messages, node doesn't receive anymore. MQTT Explorer shows the change of state of the topic but message doesn't go anyfurther... no other monitor show a change.

@OldSurferDude i'm not sure i understand

Each node should be sending messages to its own topic.

Can the mysensor gateway subscribe to more than one topic (which is mysensors-in at the mo) ?

Thanks a lot for helping me through :blush:

@JeeLet thanks a lot for your message

You're right :

• openhab 3
• Raspberry Pi 3 MQTT gateway with Mosquitto
• arduino nodes
• nRF24 network

TBH i don't know where to start, so difficult to point a finger...

Hi guys,

Long story cut short :

I've had lots of "temporary gone bad nodes" since migrating from serial to mqtt.

Nodes that are normally working fine but then stop responding (most annoying being the one driving the garage door motor :scream: i now keep a key anytime with me instead of just relying on openHab...). A reboot cures it.

So i decided to design a simple logger with arduino + sd card + rtc.

Beside that i am also designing an automatic cat flap locking node, so cats dont go out at night. As i dont want any rtc on that node, i rely on time supplied by controller with requestTime(). So here i am trying to understand how to send that request to controller via mqtt by sending publications...

That's how i discovered that many publications are lost.

What do you suggest to investigate further ? I might have reached my limits... :grimacing: some help would be welcome :+1:

Thanks a lot :blush:

@skywatch oh great :+1: thanks for that !

by removing the smd then the signal becomes "compatible" with a 2.4ghz stick antenna ?

or shall i go with wire and adjust length ?

Thanks everyone :)